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Product Introduction & Set Contents This 10-piece black rubber washers set primarily sized for 40mm sink waste connections. The set functions as a practical O rings rubber seal kit for common plumbing repairs and maintenance. It helps create watertight seals in various household fixtures. Material, Sizing & Durability Made from durable, flexible rubber, these rubber seals are designed to resist wear and exposure to water. The kit focuses on a 40mm size, with an outer diameter of approximately 43mm and an inner diameter around 38mm.The material aims to offer reliable performance as sink waste seals in typical indoor and outdoor plumbing conditions. Key Features & Sealing Performance A primary feature is the rubber’s flexibility, which allows the washer to compress and form a tight seal against pipe joints. This helps block water seepage and prevent leaks in connections. The simple, circular design of these rubber washers for plumbing facilitates easy installation without specialised tools, supporting quick DIY repairs. Versatile Application in Plumbing Tasks These rubber washers are suitable for sealing connections in kitchen and bathroom sinks,as well as other drainage points. They can be used as sink plug rubber seal replacements or for pipe joints in washing machines, garden taps, and outdoor drainage systems.A handy kit for addressing common seal issues in home maintenance. Installation Guidance & Compatibility Check Before installation,the pipe surfaces are clean and free of old sealant or debris. Hand-tighten the fitting to compress the washer adequately; avoid over-tightening. The washers for plumbing are intended for cold and warm water systems. Check that the size matches your existing fittings. Thank you for choosing us!